Precision forced alignmentsubtitle generationword-level timingaudio synchronizationtranscript mapping for your audio.
VocaSync delivers true forced alignment—not ASR. Your transcript in, your transcript out with word-level timestamps. 15 languages, SRT/VTT/JSON output, deterministic precision—no hallucinations, no omissions. Accessible through our dashboard or REST API, with pay-as-you-go pricing.
Core Capabilities
Three powerful services, one unified API
Whether you need to generate speech from text, align existing audio with transcripts, or transcribe audio to text, VocaSync handles it all with precision and speed.
Speech Synthesis
Text-to-Speech Generation
Convert any text into natural, human-like speech in 57 languages. Choose from 9 distinct AI voices with different tones and personalities. Export to MP3, AAC, OPUS, FLAC, or WAV formats.
Starting at
£0.03 per 1,000 characters
True Forced Alignment
Your Transcript → Precision Timing
Not ASR. Your transcript in = your transcript out. Acoustic alignment gives you word-level timestamps with deterministic precision. No hallucinations, no omissions. Export to SRT, VTT, or JSON.
Starting at
£0.02 per minute of audio
Transcription
Audio-to-Text with WhisperX
Convert audio to text using state-of-the-art WhisperX AI. Get segment-level timestamps automatically. Perfect for podcasts, interviews, and lectures.
Starting at
£0.01 per minute of audio
Voice Library
9 unique AI voices for every use case
From authoritative to friendly, calm to energetic—find the perfect voice for your content.
Why VocaSync
Built for developers, designed for scale
Developer-friendly REST API
Simple HTTP endpoints with JSON responses. Integrate in minutes with any language or framework. Full OpenAPI spec included.
Pay only for what you use
No subscriptions, no commitments. Top up your balance and only pay for actual usage. Generous free tier included.
Multi-language support
Generate speech in 57 languages and align audio in 15 languages including English, French, German, Spanish, Portuguese, Swedish, Czech, Polish, Turkish, Russian, Ukrainian, Japanese, Korean, and Mandarin.
Studio-grade output
HD audio quality with multiple format options. Export to MP3, AAC, OPUS, FLAC, or uncompressed WAV.
Low latency processing
Real-time synthesis with sub-300ms latency. Batch processing for large projects with parallel execution.
99.9% uptime SLA
Enterprise-grade infrastructure with automatic failover. Real-time status monitoring and incident alerts.
Developer Experience
Integrate in minutes, not days
Our REST API is designed for simplicity. Just a few lines of code to start generating speech or aligning audio. No complex SDKs to install—use any HTTP client in any language.
- RESTful endpoints with JSON payloads
- Bearer token authentication
- Comprehensive error messages
- OpenAPI 3.0 specification
// Text-to-Speech Synthesisconst response = await fetch("https://api.vocasync.io/v1/synthesis", { method: "POST", headers: { "Authorization": "Bearer voca_your_api_key", "Content-Type": "application/json" }, body: JSON.stringify({ text: "Hello, welcome to VocaSync!", voice: "nova", format: "mp3" })});const audioBlob = await response.blob();Use Cases
Powering voice across industries
E-Learning
Create accessible educational content with narrated lessons and synchronized captions.
- Course narration
- Multi-language support
- Subtitle generation
Media & Podcasts
Automate transcription and generate voiceovers for podcasts, videos, and broadcasts.
- Podcast intros/outros
- Video narration
- Transcript alignment
Accessibility
Make your content accessible with audio versions and accurate captions.
- Screen reader alternatives
- Caption generation
- Audio descriptions
Output Formats
Export your audio in the format that works best for your workflow. From compressed streaming formats to lossless studio quality.
Global Language Support
57 languages for speech synthesis—speak to the world in their native tongue.
15 languages for forced alignment with word-level precision:
Simple, transparent pricing
Only pay for what you use
Speech Synthesis
£0.03 / 1K chars
Forced Alignment
£0.02 / minute
Get Started
Ready to add voice to your app?
Create your free account and get your API key in seconds. Start with our generous free tier—just add a payment method to unlock.